Latch



E. D. CHURCH ET AL LATCH Filed Sent. 24. 1923 m w T r N Nmfi m m: T O T5. M. 0/ db J ,vals.

Patented July 1, 1924.

EDGAR D. CHURCH AND JACKSON W. VAN BRUNEI, OF SAGINAW, MICHIGAN, AS-SIGNORS 'IO JACKSON 85 CHURCH COMPANY, 0'15 SAGTNAW, MICHIGAN, ACORPORA- TION OF MICHIGAN.

LATCH.

Application filed. September 24, 1923.

T 0 all whom it may concern Be it known that we, EDGAR D. CHURCH andJACKSON W. VAN BRUNT, citizens of the United States, both residing atSag} naw, in the county of Saginaw and State of Michigan, have inventedcertain new and useful Improvements in Latches; and we do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention is a latch for use on the intermittently rotatableplaten-actuating spiders of brick presses and for other services thatrequire the use of a sliding springpressed bar having a projecting endthat acts as a detent to engage a stop provided on the heavy wheel ordisk which is to be rotated by the detent. The bolt of such a latch isusually spring-pressed outwardly and its outer end normally slides upona way or track usually circular, having abrupt ended cams that formstops at suitable inter- The outer end of the spring-pressed bar ridesover this cam surface to its end and upon running off the end of the camis forcibly projected outward by the action of the spring. A side of thelatch thereupon takes against the, end of the cam, enabling theintermittently rotatable spider to propel the platen of the press intoits next set position.

Such an intermittent grip device is com monly employed on theoscillating spiders that operate the intermittently movable platens ofsand and lime brick presses and the like.

In practice the bolts or dogs of latches that are subjected to the heavystrains incident to this class of service frequently break, temporarilyputting a brick machine out of commission. It has been found that muchof the breakage is due to the fact thatwhen the spring-pressed bolt ofthe latch rides off the end of the cam it is shot forcibly outward,striking the face of the annular track that carries the cams. When theend of the bolt repeatedly strikes the face of the track in the mannernoted, the bolt eventually becomes crystallized and breaks, and adepression is battered into the face of the cam track, causing themachine to become very noisy and often necessitating replacement of thetrack. The

Serial No. 664,616.

bolt spring also sometimes crystallizes and breaks from this repeatedjarring.

Our invention has for its objects, first, to provide on the bolt itselfa removable stop and on a wall of the channel in which the bolt slides acoacting bumper made of cushioning material to receive the impact of thebolt and thus prevent the extremity of the bolt striking the face of thetrack.

A further objectis to so shape the end of the cam and the end of thebolt as to reduce the abruptness with which the bolt runs off the end ofthe cam, consequently reducing the amount of jar or impact.

With the foregoing and certain other objects in view which will appearlater in the specifications our invention comprises the devicesdescribed and claimed and the equivalents thereof.

In the drawings Fig. 1 is a view of the latch applied to the rim of aspider of a brick machine, the latch cover removed.

Fig. 2 is a section on the line 22 of Fig. 1, the cover in place.

Fig. 3 shows the inner face of the latch cover.

Fig. 4 is an end view of the cover as viewed from 44: of Fig. 3.

1 is the belt or dog mounted in a suitable recess or channel formed inthe latch lug 2 on the rim 3 of a brick machine spider.

At 4: is indicated by dotted lines the cam and cam track on a gear to beintermittently rotated by the latch, as is common in brick of the coverto receive the bumper 6 which is hacked or reinforced by a shoulder 8 onthe cover. When the cover 7 is secured in place on the rim 3 as shown inFig. 2 the fibre bumper 6 receives the impact of the stop 5 as on acushion when the end of the bolt runs off the face of the cam, asindicated in Fig. 1.

The impact of the bolt is thereby trans-.

mitted to the spider 3 and the end of the bolt is prevented fromstriking the cam- 11 track face of gear 4:. Battering of the track andcrystallization of the spring and of bolt 1 are thereby avoided.

The sides 9 of the channel in which the bolt 1 moves back and forth arepreferably made of considerable thickness as shown in Fig. 1, so thatthe lateral strain on the side of the bolt is properly transmitted tothe rim 3 of the spider.

To prevent the end of the bolt from being projected too suddenly Whenthe eX- tremity of the cam 11 is reached We prefer to round the corner10 of the cam and to bevel the Working face of bolt 1 as shown at 13 inFig. 1.

By the means above described We have produced a simple, durable andrelatively inexpensive latch especially suited to the hard servicerequired for example in operating the intermittent platens of brickmachines or the like. Noise is reduced, crystallization of the latch andlatch spring is prevented, and by mounting one of the stop members, suchas the cushioning bumper 6, upon the removable cover 7 repairs orrenewals of either the bumper 6 or stop 5 can be made easily andquickly.

Having thus described our invention, What We claim and desire'to secureby Let ters Patent is:

In a latch of the class described, a spring pressed longitudinallydisposed bolt, a removable stop member secured to a face of said bolt, aremovable cover for said latch, a bumper of softer material than thesaid stop member removably secured to the inner face of said cover andadapted to receive the impact of said stop-member for the purposes setforth.

In testimony whereof, We afliX our signatu-res.

EDGAR D. CHURCH. JACKSON V. VAN BRUNT.

